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Rein CPE0039 Engine Coolant Reservoir Cap - RightOE Quality 60-Day Returns
Part #: CPE0039

Rein CPE0039 Engine Coolant Reservoir Cap - Right

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Fitment: Audi and Volkswagen, Q3, Q5 PHEV, Atlas, Atlas Cross Sport, ID.4, TT RS Quattro, TTS Quattro, Arteon, Golf, GTI, Jetta, Passat, A3, A3 Quattro, RS3, S3, TT Quattro, e-Golf, Tiguan, Beetle, Golf Alltrack, Golf R, Golf SportWagen, A3 Sportback e-tron, A8 Quattro, Q3 Quattro, S8, TT, Tiguan Limited, CC, Golf City, and Passat CC
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Not what you need? See all Engine Coolant Reservoir Cap options

OE-Quality Expansion Tank Cap

Rein CPE0039 is an OE-quality engine coolant reservoir cap built as a direct replacement for the factory cap. It is engineered to maintain the cooling system pressure specified by the vehicle manufacturer, helping preserve proper coolant system operation on Audi and Volkswagen applications.

Designed for fitment across a wide range of VW and Audi models, this expansion tank cap is a practical replacement for worn, cracked, or pressure-weak caps. The Rein CPE0039 is produced to match or exceed OE material standards and tolerances for consistent sealing performance.

Key Features

  • Manufactured to strict engineering standards for materials and tolerances
  • Direct-fit replacement for the original expansion tank cap
  • Meets or exceeds OE pressure specifications
  • Produced by an original equipment supplier
  • Black finish

Detailed Description

The Rein OE Quality expansion tank cap is designed for drivers and technicians who need a dependable coolant reservoir cap replacement without changing the factory cooling system design. Part number CPE0039 is made to support proper pressure retention in the expansion tank, which is critical for stable coolant system performance. It is a strong match for many Audi A3, S3, Q3, TT, and Volkswagen Golf, GTI, Tiguan, Atlas, and Jetta applications, among others.

This part cross-references 2Q0121321 and 3C0121321 for the same application.

What It Helps Fix

  • Coolant loss from a cap that no longer seals correctly
  • Pressure-related cooling system faults caused by a weak reservoir cap
  • Cracked, worn, or damaged expansion tank cap components
  • Improper coolant system pressure on Audi and Volkswagen vehicles
  • Service issues tied to an aging OE coolant reservoir cap

Installation Notes and Tips

Install CPE0039 on the correct expansion tank application and verify the cap style matches the vehicle’s OE design. Confirm the cap seats fully and locks in place before returning the vehicle to service. For fitment-specific applications, use the vehicle’s year, make, model, and position details to confirm compatibility, including Audi Q5 PHEV right-side and Audi A7 Sportback right-side listings.

Compatible With 2015-2020 Audi A3 Quattro, 2022-2026 Audi A3 Quattro, 2015-2020 Audi S3, 2022-2026 Audi S3, 2015-2025 Audi Q3, 2022-2025 Audi Q4 e-tron, 2022-2025 Audi Q4 e-tron Sportback, 2020-2025 Audi Q5 PHEV right, 2022-2025 Audi RS3, 2017-2020 Audi RS3, 2018-2025 Volkswagen Atlas, 2020-2025 Volkswagen Atlas Cross Sport, 2022-2025 Volkswagen Golf R, 2015-2019 Volkswagen Golf R, 2015-2025 Volkswagen GTI, 2025 Volkswagen ID. Buzz, 2021-2025 Volkswagen ID.4, 2017-2025 Volkswagen Jetta, 2022-2025 Volkswagen Taos, 2009-2025 Volkswagen Tiguan, 2022-2024 Audi A3, 2015-2020 Audi A3, 2016-2023 Audi TT Quattro, 2016-2023 Audi TTS Quattro, 2019-2023 Volkswagen Arteon, 2021-2022 Audi A7 Sportback right, 2018-2022 Audi TT RS Quattro, 2018-2022 Volkswagen Passat, 2015 Volkswagen Passat, 2006-2010 Volkswagen Passat, 2020-2021 Audi A8 Quattro auxiliary, 2015-2021 Volkswagen Golf, 2015-2020 Volkswagen e-Golf, 2018-2019 Volkswagen Beetle, 2017-2019 Volkswagen Golf Alltrack, 2015-2019 Volkswagen Golf SportWagen, 2016-2018 Audi A3 Sportback e-tron, 2011-2018 Audi A8 Quattro, 2015-2018 Audi Q3 Quattro, 2013-2018 Audi S8, 2018 Audi TT, 2016 Audi TT, 2017-2018 Volkswagen Tiguan Limited, 2017 Volkswagen Beetle, 2009-2017 Volkswagen CC, 2008-2010 Audi TT w/Black Cap, 2009-2010 Audi TT Quattro w/Black Cap, 2009-2010 Audi TTS Quattro w/Black Cap, 2010 Volkswagen Golf City w/Black Cap, 2009-2010 Volkswagen Passat CC, and 2009 Volkswagen Golf City w/Black Cap.

Quality Assurance

Rein designs this expansion tank cap as an OE-quality replacement produced to original equipment standards. Part number CPE0039 is backed by a 24,000-mile warranty.

BrandRein
Part NumberCPE0039
Application TypeApplicationSpecific
ColorBlack
Container TypeBG
Country of OriginDE
Item Height0.7500
Item Length3.5000
Item Level GTIN888544080333
Item Qty1
Item UOMEA
Item Weight0.1400
Item Weight Unit UOMLB
Item Width3.5000
Link to Manufacturer Pagewww.reinautomotive.com
Product Desc Extended 240Rein OE Quality expansion tank caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life.
Product Desc Invoice 40Rein Expansion Tank Cap
Product Desc Long 80Rein OE Quality Expansion Tank Cap
Product Desc Short 20Expansion Tank Cap
Warranty Distance24000

This part fits 272 vehicles. Search below:

YearMakeModelSubmodelLitersCylindersFuel TypePositionNotes
2026AudiA3 Quattro2.0LL4N/A
2026AudiS32.0LL4N/A
2025AudiA3 Quattro2.0LL4N/A
2025AudiQ32.0LL4N/A
2025AudiQ4 e-tron-L--BATTERY EV (EV/BEV)N/A
2025AudiQ4 e-tron Sportback-L--BATTERY EV (EV/BEV)N/A
2025AudiQ5 PHEV2.0LL4Right
2025AudiRS32.5LL5N/A
2025AudiS32.0LL4N/A
2025VolkswagenAtlas2.0LL4N/A
2025VolkswagenAtlas Cross Sport2.0LL4N/A
2025VolkswagenGolf R2.0LL4N/A
2025VolkswagenGTI2.0LL4N/A
2025VolkswagenID. Buzz-L--BATTERY EV (EV/BEV)N/A
2025VolkswagenID.4-L--BATTERY EV (EV/BEV)N/A
2025VolkswagenJetta1.5LL4N/A
2025VolkswagenTaos1.5LL4N/A
2025VolkswagenTiguan2.0LL4N/A
2024AudiA32.0LL4N/A
2024AudiA3 Quattro2.0LL4N/A
2024AudiQ32.0LL4N/A
2024AudiQ4 e-tron-L--BATTERY EV (EV/BEV)N/A
2024AudiQ4 e-tron Sportback-L--BATTERY EV (EV/BEV)N/A
2024AudiQ5 PHEV2.0LL4Right
2024AudiRS32.5LL5N/A
2024AudiS32.0LL4N/A
2024VolkswagenAtlas2.0LL4N/A
2024VolkswagenAtlas Cross Sport2.0LL4N/A
2024VolkswagenGolf R2.0LL4N/A
2024VolkswagenGTI2.0LL4N/A
2024VolkswagenID.4-L--BATTERY EV (EV/BEV)N/A
2024VolkswagenJetta1.5LL4N/A
2024VolkswagenTaos1.5LL4N/A
2024VolkswagenTiguan2.0LL4N/A
2023AudiA32.0LL4N/A
2023AudiA3 Quattro2.0LL4N/A
2023AudiQ32.0LL4N/A
2023AudiQ4 e-tron-L--BATTERY EV (EV/BEV)N/A
2023AudiQ4 e-tron Sportback-L--BATTERY EV (EV/BEV)N/A
2023AudiQ5 PHEV2.0LL4Right
2023AudiRS32.5LL5N/A
2023AudiS32.0LL4N/A
2023AudiTT Quattro2.0LL4N/A
2023AudiTTS Quattro2.0LL4N/A
2023VolkswagenArteon2.0LL4N/A
2023VolkswagenAtlas2.0LL4N/A
2023VolkswagenAtlas Cross Sport2.0LL4N/A
2023VolkswagenGolf R2.0LL4N/A
2023VolkswagenGTI2.0LL4N/A
2023VolkswagenID.4-L--BATTERY EV (EV/BEV)N/A
2023VolkswagenJetta1.5LL4N/A
2023VolkswagenTaos1.5LL4N/A
2023VolkswagenTiguan2.0LL4N/A
2022AudiA32.0LL4N/A
2022AudiA3 Quattro2.0LL4N/A
2022AudiA7 Sportback2.0LL4Right
2022AudiQ32.0LL4N/A
2022AudiQ4 e-tron-L--BATTERY EV (EV/BEV)N/A
2022AudiQ4 e-tron Sportback-L--BATTERY EV (EV/BEV)N/A
2022AudiQ5 PHEV2.0LL4Right
2022AudiRS32.5LL5N/A
2022AudiS32.0LL4N/A
2022AudiTT Quattro2.0LL4N/A
2022AudiTT RS Quattro2.5LL5N/A
2022AudiTTS Quattro2.0LL4N/A
2022VolkswagenArteon2.0LL4N/A
2022VolkswagenAtlas2.0LL4N/A
2022VolkswagenAtlas3.6LV6N/A
2022VolkswagenAtlas Cross Sport2.0LL4N/A
2022VolkswagenAtlas Cross Sport3.6LV6N/A
2022VolkswagenGolf R2.0LL4N/A
2022VolkswagenGTI2.0LL4N/A
2022VolkswagenID.4-L--ELECTRICN/A
2022VolkswagenJetta1.5LL4N/A
2022VolkswagenPassat2.0LL4N/A
2022VolkswagenTaos1.5LL4N/A
2022VolkswagenTiguan2.0LL4N/A
2021AudiA7 Sportback2.0LL4Right
2021AudiA8 QuattroL Plug-In Hybrid3.0LV6Auxiliary
2021AudiQ32.0LL4N/A
2021AudiQ5 PHEV2.0LL4Right
2021AudiTT Quattro2.0LL4N/A
2021AudiTT RS Quattro2.5LL5N/A
2021AudiTTS Quattro2.0LL4N/A
2021VolkswagenArteon2.0LL4N/A
2021VolkswagenAtlas2.0LL4N/A
2021VolkswagenAtlas3.6LV6N/A
2021VolkswagenAtlas Cross Sport2.0LL4N/A
2021VolkswagenAtlas Cross Sport3.6LV6N/A
2021VolkswagenGolf1.4LL4N/A
2021VolkswagenGTI2.0LL4N/A
2021VolkswagenID.4-L--ELECTRICN/A
2021VolkswagenJetta1.4LL4N/A
2021VolkswagenJetta2.0LL4N/A
2021VolkswagenPassat2.0LL4N/A
2021VolkswagenTiguan2.0LL4N/A
2020AudiA32.0LL4N/A
2020AudiA3 Quattro2.0LL4N/A
2020AudiA8 QuattroL Plug-In Hybrid3.0LV6Auxiliary
2020AudiQ32.0LL4N/A
2020AudiQ5 PHEV2.0LL4Right
2020AudiRS32.5LL5N/A
2020AudiS32.0LL4N/A
2020AudiTT Quattro2.0LL4N/A
2020AudiTT RS Quattro2.5LL5N/A
2020AudiTTS Quattro2.0LL4N/A
2020VolkswagenArteon2.0LL4N/A
2020VolkswagenAtlas2.0LL4N/A
2020VolkswagenAtlas3.6LV6N/A
2020VolkswagenAtlas Cross Sport2.0LL4N/A
2020VolkswagenAtlas Cross Sport3.6LV6N/A
2020Volkswagene-Golf-L--N/A
2020VolkswagenGolf1.4LL4N/A
2020VolkswagenGTI2.0LL4N/A
2020VolkswagenJetta1.4LL4N/A
2020VolkswagenJetta2.0LL4N/A
2020VolkswagenPassat2.0LL4N/A
2020VolkswagenTiguan2.0LL4N/A
2019AudiA32.0LL4N/A
2019AudiA3 Quattro2.0LL4N/A
2019AudiQ32.0LL4N/A
2019AudiRS32.5LL5N/A
2019AudiS32.0LL4N/A
2019AudiTT Quattro2.0LL4N/A
2019AudiTT RS Quattro2.5LL5N/A
2019AudiTTS Quattro2.0LL4N/A
2019VolkswagenArteon2.0LL4N/A
2019VolkswagenAtlas2.0LL4N/A
2019VolkswagenAtlas3.6LV6N/A
2019VolkswagenBeetle2.0LL4N/A
2019Volkswagene-Golf-L--ELECTRICN/A
2019VolkswagenGolf1.4LL4N/A
2019VolkswagenGolf Alltrack1.8LL4N/A
2019VolkswagenGolf R2.0LL4N/A
2019VolkswagenGolf SportWagen1.4LL4N/A
2019VolkswagenGolf SportWagen1.8LL4N/A
2019VolkswagenGTI2.0LL4N/A
2019VolkswagenJetta1.4LL4N/A
2019VolkswagenJetta2.0LL4N/A
2019VolkswagenPassat2.0LL4N/A
2019VolkswagenTiguan2.0LL4N/A
2018AudiA32.0LL4N/A
2018AudiA3 Quattro2.0LL4N/A
2018AudiA3 Sportback e-tron1.4LL4N/A
2018AudiA8 Quattro3.0LV6N/A
2018AudiA8 Quattro4.0LV8N/A
2018AudiQ32.0LL4N/A
2018AudiQ3 Quattro2.0LL4N/A
2018AudiRS32.5LL5N/A
2018AudiS32.0LL4N/A
2018AudiS84.0LV8N/A
2018AudiTT1.8LL4N/A
2018AudiTT Quattro2.0LL4N/A
2018AudiTT RS Quattro2.5LL5N/A
2018AudiTTS Quattro2.0LL4N/A
2018VolkswagenAtlas2.0LL4N/A
2018VolkswagenAtlas3.6LV6N/A
2018VolkswagenBeetle2.0LL4N/A
2018Volkswagene-Golf-L--ELECTRICN/A
2018VolkswagenGolf1.8LL4N/A
2018VolkswagenGolf Alltrack1.8LL4N/A
2018VolkswagenGolf R2.0LL4N/A
2018VolkswagenGolf SportWagen1.8LL4N/A
2018VolkswagenGTI2.0LL4N/A
2018VolkswagenJetta1.8LL4N/A
2018VolkswagenPassat2.0LL4N/A
2018VolkswagenTiguan2.0LL4N/A
2018VolkswagenTiguan Limited2.0LL4N/A
2017AudiA32.0LL4N/A
2017AudiA3 Quattro2.0LL4N/A
2017AudiA3 Sportback e-tron1.4LL4N/A
2017AudiA8 Quattro3.0LV6N/A
2017AudiA8 Quattro4.0LV8N/A
2017AudiQ32.0LL4N/A
2017AudiQ3 Quattro2.0LL4GASN/A
2017AudiRS32.5LL5N/A
2017AudiS32.0LL4N/A
2017AudiS84.0LV8N/A
2017AudiTT Quattro2.0LL4N/A
2017AudiTTS Quattro2.0LL4N/A
2017VolkswagenBeetle1.8LL4N/AFrom 6/1/17
2017VolkswagenBeetle2.0LL4N/AFrom 6/1/17
2017VolkswagenCC3.6LV6N/A
2017Volkswagene-Golf-L--ELECTRICN/A
2017VolkswagenGolf1.8LL4N/A
2017VolkswagenGolf Alltrack1.8LL4N/A
2017VolkswagenGolf R2.0LL4N/A
2017VolkswagenGolf SportWagen1.8LL4N/A
2017VolkswagenGTI2.0LL4N/A
2017VolkswagenJetta1.8LL4N/A
2017VolkswagenTiguan2.0LL4N/A
2017VolkswagenTiguan Limited2.0LL4N/A
2016AudiA31.8LL4N/A
2016AudiA32.0LL4DIESELN/A
2016AudiA3 Quattro2.0LL4N/A
2016AudiA3 Sportback e-tron1.4LL4N/A
2016AudiA8 Quattro3.0LV6GASN/A
2016AudiA8 Quattro4.0LV8N/A
2016AudiA8 Quattro6.3LW12N/A
2016AudiQ32.0LL4GASN/A
2016AudiQ3 Quattro2.0LL4N/A
2016AudiS32.0LL4N/A
2016AudiS84.0LV8N/A
2016AudiTT2.0LL4N/A
2016AudiTT Quattro2.0LL4N/A
2016AudiTTS Quattro2.0LL4N/A
2016VolkswagenCC3.6LV6N/A
2016Volkswagene-Golf-L--ELECTRICN/A
2016VolkswagenGolf1.8LL4N/A
2016VolkswagenGolf R2.0LL4N/A
2016VolkswagenGolf SportWagen1.8LL4N/A
2016VolkswagenGTI2.0LL4N/A
2016VolkswagenTiguan2.0LL4N/A
2015AudiA31.8LL4N/A
2015AudiA32.0LL4DIESELN/A
2015AudiA3 Quattro2.0LL4N/A
2015AudiA8 Quattro3.0LV6GASN/A
2015AudiA8 Quattro4.0LV8N/A
2015AudiA8 Quattro6.3LW12N/A
2015AudiQ32.0LL4GASN/A
2015AudiQ3 Quattro2.0LL4N/A
2015AudiS32.0LL4N/A
2015AudiS84.0LV8N/A
2015VolkswagenCC3.6LV6N/A
2015Volkswagene-Golf-L--ELECTRICN/A
2015VolkswagenGolf1.8LL4N/A
2015VolkswagenGolf2.0LL4DIESELN/A
2015VolkswagenGolf R2.0LL4N/A
2015VolkswagenGolf SportWagen1.8LL4N/A
2015VolkswagenGolf SportWagen2.0LL4DIESELN/A
2015VolkswagenGTI2.0LL4N/A
2015VolkswagenPassat2.0LL4DIESELN/A
2015VolkswagenTiguan2.0LL4N/A
2014AudiA8 Quattro3.0LV6GASN/A
2014AudiA8 Quattro4.0LV8N/A
2014AudiA8 Quattro6.3LW12N/A
2014AudiS84.0LV8N/A
2014VolkswagenCC3.6LV6N/A
2014VolkswagenTiguan2.0LL4N/A
2013AudiA8 Quattro3.0LV6N/A
2013AudiA8 Quattro4.0LV8N/A
2013AudiA8 Quattro6.3LW12N/A
2013AudiS84.0LV8N/A
2013VolkswagenCC3.6LV6N/A
2013VolkswagenTiguan2.0LL4N/A
2012AudiA8 Quattro4.2LV8N/A
2012AudiA8 Quattro6.3LW12N/A
2012VolkswagenCC3.6LV6N/A
2012VolkswagenTiguan2.0LL4N/A
2011AudiA8 Quattro4.2LV8N/A
2011VolkswagenCC3.6LV6N/A
2011VolkswagenTiguan2.0LL4N/A
2010AudiTT2.0LL4N/Aw/Black Cap
2010AudiTT Quattro2.0LL4N/Aw/Black Cap
2010AudiTTS Quattro2.0LL4N/Aw/Black Cap
2010VolkswagenCC3.6LV6N/A
2010VolkswagenGolf City2.0LL4N/Aw/Black Cap
2010VolkswagenPassat3.6LV6N/A
2010VolkswagenPassat CC3.6LV6N/A
2010VolkswagenTiguan2.0LL4N/A
2009AudiTT2.0LL4N/Aw/Black Cap
2009AudiTT Quattro2.0LL4N/Aw/Black Cap
2009AudiTTS Quattro2.0LL4N/Aw/Black Cap
2009VolkswagenCC3.6LV6N/A
2009VolkswagenGolf City2.0LL4N/AFrom 4/13/09, w/Black Cap
2009VolkswagenPassat3.6LV6N/A
2009VolkswagenPassat CC3.6LV6N/A
2009VolkswagenTiguan2.0LL4N/A
2008AudiTT2.0LL4N/Aw/Black Cap
2008VolkswagenPassat3.6LV6N/A
2007VolkswagenPassat3.6LV6N/A
2006VolkswagenPassat3.6LV6N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.